Patents by Inventor Keisuke Shiba
Keisuke Shiba has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4144071Abstract: A silver halide photographic light-sensitive material having improved image quality which comprises at least one hydrophilic colloid layer containing at least one reducing compound, preferably having an oxidation potential less than about 1.Type: GrantFiled: February 28, 1977Date of Patent: March 13, 1979Assignee: Fuji Photo Film Co., Ltd.Inventors: Keisuke Shiba, Toshiaki Aono, Takeshi Hirose, Tadao Shishido
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Patent number: 4138258Abstract: A multilayer color photographic material comprising a support having thereon at least a blue-sensitive silver halide emulsion containing a yellow coupler, a green-sensitive silver halide emulsion layer containing a magenta coupler, and a red-sensitive silver halide emulsion layer containing a cyan coupler, with the red-sensitive silver halide emulsion layer or a gelatin interlayer adjacent the red-sensitive silver halide emulsion layer containing a non-diffusible colored compound which, on coupling reaction with the oxidation product of a primary aromatic amino developing agent at development, can release a diffusible dye capable of being removed from the photographic layer.Type: GrantFiled: June 9, 1977Date of Patent: February 6, 1979Assignee: Fuji Photo Film Co., Ltd.Inventors: Takeshi Hirose, Keisuke Shiba, Yukio Yokota, Kozo Inouye, Akio Okumura
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Patent number: 4105452Abstract: A multi-layered color photographic light-sensitive material which comprises a support having thereon at least two light-sensitive silver halide emulsion layers which provide images having substantially different hues, with the light-sensitive material including 2-equivalent couplers and/or 4-equivalent anilinopyrazolone couplers and at least one of the light-sensitive silver halide emulsion layers or a colloidal layer of the light-sensitive material containing a hydroquinone derivative or a hydroquinone precursor substituted with a heterocyclic monothio group and an aliphatic monothio group, an aryl monothio group, an aliphatic oxy group, an aryloxy group or a heterocyclic oxy group and having a ballasting group containing 8 or more carbon atoms.Type: GrantFiled: April 2, 1976Date of Patent: August 8, 1978Assignee: Fuji Photo Film Co., Ltd.Inventors: Keisuke Shiba, Toshiaki Aono, Seiiti Kubodera, Takeshi Hirose, Reiichi Ohi, Tadao Shishido
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Patent number: 4086094Abstract: A light-sensitive silver halide photographic material comprising a support having thereon at least one hydrophilic colloid layer which contains a color-forming coupler having a nitrogen-containing residue releasable on reaction of the coupler with an oxidation product of a color developing agent and which contains a thiocarbonyl group (S.dbd.C<), a selenocarbonyl group (Se.dbd.C<) or a telluriumcarbonyl group (Te.dbd.C<), the nitrogen atom of the nitrogen-containing residue being attached to the carbon atom in the coupling position of the coupler.Type: GrantFiled: June 19, 1975Date of Patent: April 25, 1978Assignee: Fuji Photo Film Co., Ltd.Inventors: Keisuke Shiba, Takeshi Hirose, Kozo Inouye, Akio Okumura
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Patent number: 4083721Abstract: A photographic coupler represented by the following formula (I)[a] -- nhcor (i)wherein A represents a cyan color forming coupler residue having a naphthol nucleus or a phenol nucleus; the RCONH-group is a substituted in the coupling position of [A], and R represents (1) an aliphatic hydrocarbon or alicyclic hydrocarbon group which has at least one electron attractive substituent in the .alpha.-position to the carbonyl group in the RCONH- group, or (2) an aryl group, a heterocyclic group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an acyl group or an amino group which may be substituted with one or more electron attractive substituents, and R as defined by (1) or (2) above is a residue of a carboxylic acid of the formula RCOOH having a pKa of about 1.Type: GrantFiled: December 8, 1976Date of Patent: April 11, 1978Assignee: Fuji Photo Film Co., Ltd.Inventors: Kozo Inouye, Yukio Yokota, Akio Okumura, Keisuke Shiba, Seiiti Kubodera
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Patent number: 4040835Abstract: A two-equivalent magenta coupler forming magenta dye images in a color photographic material by a coupling reaction with an oxidation product of a primary aromatic amino color developing agent and having the formula (I) ##STR1## wherein [A] represents a residue of a magenta dye-forming coupler; ##STR2## represents a group which is substituted for one of the hydrogen atoms of the active methylene group of the coupler A; Z represents a hydrogen atom, an alkyl group, an aryl group, or a heterocyclic group; B represents a --D-Y residue or an --N Q residue; D represents an oxygen atom, a sulfur atom, or an --NR-- group; R of the --NR-- group represents a hydrogen atom, an alkyl group, or an aryl group; Y represents an alkyl group, an aryl group, or a heterocyclic group; Q of the --N Q residue represents a non-metal atomic group necessary for forming a 5-membered or 6-membered nitrogen-containing heterocyclic group; n is 1 or 2 and when n is 2, B can also represent a --Y group; a color photographic silver halide liType: GrantFiled: June 27, 1975Date of Patent: August 9, 1977Assignee: Fuji Photo Film Co., Ltd.Inventors: Atsuaki Arai, Keisuke Shiba, Minoru Yamada, Nobuo Furutachi, Kotaro Nakamura
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Patent number: 4032345Abstract: A photographic 2-equivalent color coupler capable of coupling with the oxidation product of an aromatic primary amine developing agent in which the coupling position is substituted with an isothiocyanato group; a color photographic emulsion, material, and developer containing the above-described 2-equivalent color coupler; and a method of forming color images comprising developing an exposed silver halide photographic material in the presence of the above-described 2-equivalent color coupler.Type: GrantFiled: August 1, 1975Date of Patent: June 28, 1977Assignee: Fuji Photo Film Co., Ltd.Inventors: Kozo Inouye, Yukio Yokota, Akio Okumura, Seiiti Kubodera, Keisuke Shiba
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Patent number: 4029508Abstract: A yellow color forming photographic coupler represented by the following general formula (I): ##STR1## wherein Q represents an aliphatic group, an alicyclic group, an aromatic group or a heterocyclic group; Y represents a hydrogen atom, an aliphatic group, an alicyclic group, an aromatic group or a heterocyclic group; R represents a divalent aliphatic group, a divalent alicyclic group, a divalent aromatic group or a divalent heterocyclic group; and Z represents an oxygen atom, a sulfur atom or a nitrogen atom substituted with an electron attracting group.Type: GrantFiled: August 14, 1975Date of Patent: June 14, 1977Assignee: Fuji Photo Film Co., Ltd.Inventors: Mitsugu Tanaka, Atsuaki Arai, Kiyoshi Nakazyo, Keisuke Shiba
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Patent number: 4022620Abstract: A method of forming color photographic images which comprises developing image-exposed photographic silver halide emulsion layer with a primary aromatic amino color developing agent in the presence of a yellow color forming coupler represented by the following general formula (I) ##STR1## wherein X.sub.1 represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group or an acyl group; X.sub.2 represents a hydrogen atom, an alkyl group or an aryl group; X.sub.3 represents a hydrogen atom, an alkyl group, an aryl group or an acyl group; Y represents an oxygen atom or a sulfur atom; and Q represents a residue of a yellow color forming coupler, e.g., a yellow coupler in which one hydrogen atom attached to the active methylene group of the coupler is eliminated. These yellow color forming couplers provide yellow color images having superior properties.Type: GrantFiled: April 3, 1975Date of Patent: May 10, 1977Assignee: Fuji Photo Film Co., Ltd.Inventors: Akio Okumura, Atsushi Sugizaki, Seiji Ichijima, Keisuke Shiba, Kiyoshi Nakazyo
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Patent number: 4021248Abstract: A color photographic light-sensitive material comprising a silver halide photographic emulsion containing (1) at least one compound selected from the group consisting of (a) a compound represented by the following general formula (I);cp - Z (I)wherein Cp represents a monovalent residue of a magenta or yellow coupler residue in which one hydrogen atom of the active methylene group is replaced by a coupling off group Z eliminated upon coupling reaction with an oxidation product of an aromatic primary amine color developing agent, and Z represents a nitrogen-containing coupling-off group connected to Cp at a nitrogen atom thereof, and (b) a 4-position unsubstituted 3-arylamino-5-pyrazolone derivative, and (2) at least one compound represented by the following general formula (II);q - sh (ii)wherein Q represents a heterocyclic group, bonded directly or indirectly thereto and containing at least one of a --SO.sub.Type: GrantFiled: September 3, 1975Date of Patent: May 3, 1977Assignee: Fuji Photo Film Co., Ltd.Inventors: Keisuke Shiba, Kiyoshi Nakazyo, Reiichi Ohi, Keiichi Adachi
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Patent number: 4015988Abstract: A multilayer color photographic light-sensitive material comprising a support having thereon at least two silver halide emulsion layer units, each of which is sensitive to radiation of a substantially different wavelength region within the wavelength region of from about 220 nm to about 800 nm and contains a color-forming coupler capable of forming a dye on coupling with an oxidized primary aromatic amine developing agent, with at least one of the emulsion layer units containing an ICC coupler represented by the general formula (I) ##STR1## wherein Cp represents a coupler residue; L and M each represents a nitrogen atom or a methine group, V represents a monocyclic or dicyclic aromatic ring of the benzene series, and at least one of L and M represnts a nitrogen atom; which releases a triazole derivative or a diazole derivative on coupling with an oxidized primary aromatic amine developing agent, and with the emulsion layer unit containing the ICC coupler represented by the general formula (I) or another layerType: GrantFiled: March 4, 1975Date of Patent: April 5, 1977Assignee: Fuji Photo Film Co., Ltd.Inventors: Keisuke Shiba, Takeshi Hirose, Jun Hayashi, Toshiaki Aono
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Patent number: 4012259Abstract: A photographic silver halide emulsion containing a yellow color forming coupler, in which one hydrogen atom of an active methylene group is replaced by a 2,5-dioxo-1-imidazolidinyl group, in which a nitrogen atom at 3-position and a carbon atom at 4-position are connected to form a ring through a divalent aliphatic radical, a photographic element containing the emulsion and a method for forming color photographic images which comprises developing the image-exposed photographic silver halide emulsion with a primary aromatic amino developing agent. These yellow color forming couplers have a high coupling reactivity as well as no adverse effect on the bleaching of developed silver and thus they are suitable for use in rapid processing type color photographic materials.Type: GrantFiled: May 14, 1974Date of Patent: March 15, 1977Assignee: Fuji Photo Film Co., Ltd.Inventors: Akio Okumura, Akira Sato, Seiji Ichijima, Keisuke Shiba, Kiyoshi Nakazyo
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Patent number: 3990896Abstract: A method of forming color photographic images which comprises developing an image-exposed photographic silver halide emulsion layer with a primary aromatic amino color developing agent in the presence of a yellow color forming coupler, in which one hydrogen atom of an active methylene group is substituted with a 5-alkylidene-3-hydantoinyl group and a color photographic light-sensitive element which comprises a silver halide emulsion containing a yellow color forming coupler, in which one hydrogen atom of an active methylene group of the coupler is substituted with a 5-alkylidene-3-hydantoinyl group. These yellow color forming couplers have a high coupling reactivity and additionally provide a stable coupler dispersion.Type: GrantFiled: October 9, 1974Date of Patent: November 9, 1976Assignee: Fuji Photo Film Co., Ltd.Inventors: Atsuaki Arai, Akio Okumura, Seiji Ichijima, Keisuke Shiba, Kiyoshi Nakazyo
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Patent number: 3990899Abstract: An incorporated-coupler multi-layered color photographic light-sensitive material which comprises a support having thereon at least two light-sensitive emulsion layer units which provide, upon color development, images having substantially different hues, at least one of the light-sensitive emulsion layer units comprising two or more unit layers in which at least one of which unit layers contain an ICC uncolored coupler alone or in combination with another coupler.Type: GrantFiled: May 6, 1974Date of Patent: November 9, 1976Assignee: Fuji Photo Film Co., Ltd.Inventors: Keisuke Shiba, Takeshi Hirose, Jun Hayashi
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Patent number: 3984245Abstract: A photographic photosensitive material comprising a support having thereon at least one photosensitive silver halide emulsion layer, at least one photosensitive silver halide emulsion layer containing a compound which releases an organic development inhibitor on development, and a colloid layer containing a basic synthetic polymer containing therein the repeating unit represented by the formula (I) ##EQU1## wherein R.sub.1 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; R.sub.2 represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or an aryl group; m is 1 or 2; n is 1 or 2; q is 1 or 2; and A.sub.1 represents a group containing a nitrogen atom which forms a secondary amino group, a tertiary amino group or a quaternary ammonium group, and A.sub.1 may combine with R.sub.2 ; or the formula (II) ##EQU2## wherein A.sub.2 represents a hydrogen atom or a substituted or unsubstituted alkyl group; A.sub.Type: GrantFiled: October 9, 1974Date of Patent: October 5, 1976Assignee: Fuji Photo Film Co., Ltd.Inventors: Takeshi Hirose, Keisuke Shiba
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Patent number: 3982950Abstract: A silver halide photographic emulsion for use in flash exposure, which contains a sensitizing amount of a defined simple merocyanine dye.Type: GrantFiled: February 4, 1975Date of Patent: September 28, 1976Assignee: Fuji Photo Film Co., Ltd.Inventors: Keisuke Shiba, Haruo Takei, Akira Sato, Akira Ogawa
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Patent number: 3977882Abstract: A silver halide photographic emulsion which is spectrally sensitized so that it has a maximum sensitivity wave length within the region of 580-640 nm, characterized by containing in a super sensitizing amount the combination of at least one carbocyanine dye represented by the general formula (I) and at least one of the dyes selected from the group consisting of dyes represented by the general formula (II): ##EQU1## WHEREIN Z.sub.1 represents the grouping necessary for the formation of .beta.-naphthothiazole or .beta.-naphthoselenazole ring, Z.sub.2 represents the grouping necessary for the formation of benzoxazole ring, A.sub.1 represents a hydrogen atom, an alkyl radical or an aryl radical, R.sub.1 represents an alkyl group and R.sub.2 represents a hydroxyalkyl group, a carboxyalkyl group or an alkyl group substituted with a sulfo group, X.sub.1 represents an acid anion group, an l is 1 or 2, the dye forming an intramolecular salt when l is 1: ##EQU2## WHEREIN Z.sub.3 and Z.sub.Type: GrantFiled: July 17, 1975Date of Patent: August 31, 1976Assignee: Fuji Photo Film Co., Ltd.Inventors: Keisuke Shiba, Akira Sato
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Patent number: 3973969Abstract: Silver halide photographic emulsions are supersensitized by a combination of at least one sensitizing dye represent by following general formula (I): ##EQU1## And at least one sensitizing dye represented by following general formula (II): ##SPC1##Specific moieties given in the above formulae are identified in the specification.Type: GrantFiled: May 2, 1975Date of Patent: August 10, 1976Assignee: Fuji Photo Film Co., Ltd.Inventors: Keisuke Shiba, Masanao Hinata, Hirotetu Kato, Akiro Sato, Akira Ogawa
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Fogged, direct-positive silver halide emulsion containing carbocyanine dye having indolenine nucleus
Patent number: 3970461Abstract: A direct positive silver halide photographic emulsion containing a dye represented by the following general formula: ##SPC1##Wherein R and R.sub.1 are selected from the first group consisting of alkyl, allyl, substituted alkyl, aryl, and substituted aryl groups, at least one of the R and R.sub.1 being an alkyl group substituted with a carboxyl or sulfo radical; R.sub.2 and R.sub.3 are selected from the second group consisting of alkyl, aralkyl and allyl groups; L.sub.1 is selected from the third group consisting of methine and an atomic group capable of combining with R.sub.1, R.sub.2 or R.sub.3 to form a ring; L.sub.2 is methine; L.sub.3 is selected from the fourth group consisting of methine and an atomic group capable of forming a ring with R.sub.1 or a 3,3-substituent of an indolenine ring at the site near to L.sub.3, L.sub.3, such that a ring may be formed by L.sub.1 and L.sub.Type: GrantFiled: July 6, 1973Date of Patent: July 20, 1976Assignee: Fuji Photo Film Co., Ltd.Inventors: Keisuke Shiba, Masanao Hinata, Akira Sato, Akira Ogawa, Hirotetu Kato -
Patent number: RE29379Abstract: A color photographic silver halide light-sensitive material which comprises a support having thereon at least two light-sensitive layers, at least one of said layers containing a compound capable of coupling with an oxidation product of a color developing agent and in which splitable hetero aromatic ring containing a triazole or diazole ring is connected to the carbon atom in the coupling position, through the nitrogen atom in the 1-position of said triazole or diazole ring.Type: GrantFiled: April 21, 1976Date of Patent: August 30, 1977Assignee: Fuji Photo Film Co., Ltd.Inventors: Keisuke Shiba, Nobuo Furutachi, Harumi Katsuyama, Takeshi Hirose, Toshiaki Aono, Shoji Ishiguro